Let it be said that stem cell therapies may well be the future of medicine, but untested stem cell therapies have the potential to give rise to the stuff of nightmares. Case in point: the unnamed cosmetic surgery patient in this piece by SciAm's Ferris Jabr, who, after dropping 20 grand on an untested,…

The first European embryonic stem cell therapy in humans is about to start in London. Surgeons will insert the controversial cells into the eyes of 12 patients suffering from Stargardt's macular dystrophy, a major cause of blindness in young people.